A168350 - OEIS

%I #3 Mar 30 2012 18:52:37

%S 0,1,4,9,16,24,33,43,54,67,81,96,112,129,148,168,189,211,235,260,286,

%T 313,341,370,401,433,466,500,535,571,609,648,688,729,772,816,861,907,

%U 955,1004,1054,1105,1157,1211,1266,1322,1379,1437,1496,1557,1619,1682

%N Sum of first n non-single or nonisolated numbers.

%F a(n)=sum{j=1..n} A167707(j).

%e a(1)=0, a(2)=0+1=1, a(3)=0+1+3=4.

%Y Cf. A167707.

%K nonn

%O 1,3

%A _Juri-Stepan Gerasimov_, Nov 23 2009

%E Formula and A-number corrected and entries checked by _R. J. Mathar_, Nov 24 2009